I am a prime number.
The double of myself is equal to the square of me.

which number am I?

Can you find the largest Three-digit number whose sum is 14 and whose square is less than 5,00,000?

Which digit occurred maximum times between the number 1 and 1000?

Why blonde cannot dial 911?

John and Jenni are a married couple. They have two kids, one of them is a girl. Assume safely that the probability of each gender is 1/2.
What is the probability that the other kid is also a girl?

Hint: It is not 1/2 as you would first think.

Arrange the numbers 1, 2, 3, 4, 5, 6, 7, 8 and 9 above and below the division line in a manner that the thus formed fractions equal to 1/3.

(You can use one number only once)

Identify the next two numbers in this series.

101, 112, 131, 415, 161, 718, ???, ???

Two girls were born to the same mother, on the same day, at the same time, in the same month and year and yet they're not twins. How can this be ?

What is the next number in this series?

4,12,84,3612....

A woman lives in a Tall building thirty-six floors high and served by several elevators which stop at each floor going up and down. Each morning she leaves her apartment and goes to one of the elevators. Whichever one she takes is three times more likely to be going up than down. Why?